Marakana android-java developers
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This document provides an overview of Android development for Java developers. It discusses Android's history and its relationship to Java. It describes the Android SDK and how to create a basic "Hello World" Android app. It also outlines the main building blocks of Android apps including activities, intents, services, content providers, and broadcast receivers. The document concludes with a discussion of debugging tools like LogCat, the debugger, and TraceView.
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Marakana android-java developers
- 1. Android For Java Developers Marko Gargenta Marakana
- 2. Agenda • Android History • Android and Java • Android SDK • Hello World! • Main Building Blocks • Debugging • Summary
- 3. History 2005 Google buys Android, Inc. Work on Dalvik starts 2007 OHA Announced Early SDK 2008 G1 Announced SDK 1.0 Released 2009 G2 Released Cupcake, Donut, Eclair
- 4. Android and Java Android Java = Java SE – AWT/Swing + Android API
- 5. Android SDK -‐ What’s in the box SDK Tools Docs Platforms Data Skins Images Samples Add-ons Google Maps
- 6. The Tools Tools are important part of the SDK. They are available via Eclipse plugin as well as command line shell.
- 7. HELLO WORLD!
- 8. Create New Project Use the Eclipse tool to create a new Android project. Here are some key constructs: Project Eclipse construct Target minimum to run App name whatever Package Java package AcXvity Java class
- 9. The Manifest File <?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.marakana" android:versionCode="1" android:versionName="1.0"> <application android:icon="@drawable/icon" android:label="@string/app_name"> <activity android:name=".HelloAndroid" android:label="@string/app_name"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> <uses-sdk android:minSdkVersion="5" /> </manifest>
- 10. The Layout Resource <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" > <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="@string/hello" /> </LinearLayout>
- 11. The Java File package com.marakana; import android.app.Activity; import android.os.Bundle; public class HelloAndroid extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); } }
- 14. AcXviXes Activity is to an Android Application application what a Main Activity Another Another Activity Activity web page is to a website. Sort of.
- 15. AcXvity Lifecycle Starting Activities have a well- (1) onCreate() (2) onStart() (3) onRestoreInstanceState() defined lifecycle. The (4) onResume() Android OS manages your activity by Running changing its state. (3) onResume() (2) onStart() (1) onSaveInstanceState() (2) onPause() You fill in the blanks. (1) onRestart() onResume() (1) onSaveInstanceState() Stopped (2) onStop() Paused onDestroy() or <process killed> <process killed> Destroyed
- 16. Intents Intents are to Android Application Android apps Another Main Activity Intent what hyperlinks Activity are to websites. They can be Intent implicit and Android Application explicit. Sort of like absolute and Main Activity Intent Another Activity relative links.
- 17. Services A service is something that can be started and stopped. It doesn’t have UI. It is typically managed by an activity. Music player, for example
- 18. Service Lifecycle Service also has a Starting lifecycle, but it’s (1) onCreate() much simpler than (2) onStart() activity’s. An activity onStart() typically starts and stops a service to do Stopped Running some work for it in the background. onStop() Such as play music, check for new onDestroy() or tweets, etc. <process killed> Destroyed
- 19. Content Providers Content Providers share Content content with applications Provider across application Content URI boundaries. insert() Examples of built-in update() Content Providers are: delete() Contacts, MediaStore, query() Settings and more.
- 20. Broadcast Receivers An Intent-based publish-subscribe mechanism. Great for listening system events such as SMS messages.
- 21. DEBUGGING ANDROID APPS
- 22. LogCat The universal, most versatile way to track what is going on in your app. Can be viewed via command line or Eclipse. Logs can be generated both from SDK Java code, or low-level C code via Bionic libc extension.
- 23. Debugger Your standard debugger is included in SDK, with all the usual bells & whistles.
- 24. TraceView TraceView helps you profile you application and find bottlenecks. It shows execution of various calls through the entire stack. You can zoom into specific calls.
- 25. Hierarchy Viewer Hierarchy Viewer helps you analyze your User Interface. Base UI tends to be the most “expensive” part of your application, this tool is very useful.
- 26. Summary Android is based on Java. You write Java code, but technically don’t run it. Java is augmented with XML, mostly for UI purposes. Android Java is mostly based on Java SE with replacement UI libraries. Marko Gargenta, Marakana.com [email protected] +1-415-647-7000 Licensed under Creative Commons License (cc-by-nc-nd). Please Share!